extlib/leaflet/src/core/Class.js

   1 /*
   2  * Class powers the OOP facilities of the library. Thanks to John Resig and Dean Edwards for inspiration!
   3  */
   4
   5 L.Class = function() {};
   6
   7 L.Class.extend = function(/*Object*/ props) /*-> Class*/ {
   8
   9         // extended class with the new prototype
  10         var NewClass = function() {
  11                 if (!L.Class._prototyping && this.initialize) {
  12                         this.initialize.apply(this, arguments);
  13                 }
  14         };
  15
  16         // instantiate class without calling constructor
  17         L.Class._prototyping = true;
  18         var proto = new this();
  19         L.Class._prototyping = false;
  20
  21         proto.constructor = NewClass;
  22         NewClass.prototype = proto;
  23
  24         // add superclass access
  25         proto.superclass = this.prototype;
  26
  27         // add class name
  28         //proto.className = props;
  29
  30         // mix static properties into the class
  31         if (props.statics) {
  32                 L.Util.extend(NewClass, props.statics);
  33                 delete props.statics;
  34         }
  35
  36         // mix includes into the prototype
  37         if (props.includes) {
  38                 L.Util.extend.apply(null, [proto].concat(props.includes));
  39                 delete props.includes;
  40         }
  41
  42         // merge options
  43         if (props.options && proto.options) {
  44                 props.options = L.Util.extend({}, proto.options, props.options);
  45         }
  46
  47         // mix given properties into the prototype
  48         L.Util.extend(proto, props);
  49
  50         // allow inheriting further
  51         NewClass.extend = arguments.callee;
  52
  53         // method for adding properties to prototype
  54         NewClass.include = function(props) {
  55                 L.Util.extend(this.prototype, props);
  56         };
  57
  58         //inherit parent's statics
  59         for (var i in this) {
  60                 if (this.hasOwnProperty(i) && i != 'prototype') {
  61                         NewClass[i] = this[i];
  62                 }
  63         }
  64
  65         return NewClass;
  66 };